1 files changed, 80 insertions, 0 deletions
diff --git a/browser/components/doh/test/unit/test_heuristics.js b/browser/components/doh/test/unit/test_heuristics.js
new file mode 100644
index 0000000000..a6a6c9b6c9
--- /dev/null
+++ b/browser/components/doh/test/unit/test_heuristics.js
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+"use strict";
+
+const { MockRegistrar } = ChromeUtils.importESModule(
+  "resource://testing-common/MockRegistrar.sys.mjs"
+);
+
+let cid;
+
+async function SetMockParentalControlEnabled(aEnabled) {
+  if (cid) {
+    MockRegistrar.unregister(cid);
+  }
+
+  let parentalControlsService = {
+    parentalControlsEnabled: aEnabled,
+    QueryInterface: ChromeUtils.generateQI(["nsIParentalControlsService"]),
+  };
+  cid = MockRegistrar.register(
+    "@mozilla.org/parental-controls-service;1",
+    parentalControlsService
+  );
+}
+
+registerCleanupFunction(() => {
+  if (cid) {
+    MockRegistrar.unregister(cid);
+  }
+});
+
+add_task(setup);
+
+add_task(async function test_parentalControls() {
+  let DoHHeuristics = ChromeUtils.importESModule(
+    "resource:///modules/DoHHeuristics.sys.mjs"
+  );
+
+  let parentalControls = DoHHeuristics.parentalControls;
+
+  Assert.equal(
+    await parentalControls(),
+    "enable_doh",
+    "By default, parental controls should be disabled and doh should be enabled"
+  );
+
+  SetMockParentalControlEnabled(false);
+
+  Assert.equal(
+    await parentalControls(),
+    "enable_doh",
+    "Mocked parental controls service is disabled; doh is enabled"
+  );
+
+  SetMockParentalControlEnabled(true);
+
+  Assert.equal(
+    await parentalControls(),
+    "enable_doh",
+    "Default value of mocked parental controls service is disabled; doh is enabled"
+  );
+
+  SetMockParentalControlEnabled(false);
+
+  Assert.equal(
+    await parentalControls(),
+    "enable_doh",
+    "Mocked parental controls service is disabled; doh is enabled"
+  );
+
+  MockRegistrar.unregister(cid);
+
+  Assert.equal(
+    await parentalControls(),
+    "enable_doh",
+    "By default, parental controls should be disabled and doh should be enabled"
+  );
+});